Powerful punch

AFP/Getty Images

A South Korean army special forces soldier breaks stone plates in a martial arts demonstration during a welcoming ceremony for the Seoul International Aerospace and Defense Exhibition at the Defense Ministry in Seoul.

A South Korean army special forces soldier breaks stone plates in a martial arts demonstration during a welcoming ceremony for the Seoul International Aerospace and Defense Exhibition at the Defense Ministry in Seoul. (AFP/Getty Images)

A South Korean army special forces soldier breaks stone plates in a martial arts demonstration during a welcoming ceremony for the Seoul International Aerospace and Defense Exhibition at the Defense Ministry in Seoul.